Heather’s Truth by Regan Black

If still waters run deep, her cheerful smile hides an ocean of secrets…
Growing up in small-town South Carolina, Heather Morris knows a bright smile can be an effective shield, especially during her shifts at the local coffee shop. And hiding her true suspicions is essential when she stumbles across an ugly criminal enterprise.
But she can’t exact justice alone. Fortunately, she knows an FBI agent who just might help.
Special Agent Dale Nichols is ruthless about closing cases. And when Heather–of all people–drops a corruption case on his desk, he’s sure she’s misinterpreted something. Digging in, he soon learns she’s right. What’s worse? The criminals have learned she’s the whistleblower.
To protect her, and hide the real reason he’s suddenly hanging around, he proposes, wedging himself between her and the operation that wants her dead.
As Dale and Heather scramble to find justice, will it be the killers hunting them or the fake engagement that destroys their chance for a future?